// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_CACHE_HANDLE_H_
#define CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_CACHE_HANDLE_H_

#include "base/memory/weak_ptr.h"
#include "content/browser/cache_storage/cache_storage.h"
#include "content/browser/cache_storage/cache_storage_cache.h"

namespace content {

// Holds a reference to a CacheStorageCache. The CacheStorage will keep the
// CacheStorageCache alive until the last handle is destroyed or the
// CacheStorage is deleted.
class CONTENT_EXPORT CacheStorageCacheHandle {
public:
    ~CacheStorageCacheHandle();

    // Returns the underlying CacheStorageCache*. Will return nullptr if the
    // CacheStorage has been deleted.
    CacheStorageCache* value() { return cache_storage_cache_.get(); }

    std::unique_ptr<CacheStorageCacheHandle> Clone();

private:
    friend class CacheStorage;

    CacheStorageCacheHandle(base::WeakPtr<CacheStorageCache> cache_storage_cache,
        base::WeakPtr<CacheStorage> cache_storage);

    base::WeakPtr<CacheStorageCache> cache_storage_cache_;
    base::WeakPtr<CacheStorage> cache_storage_;

    DISALLOW_COPY_AND_ASSIGN(CacheStorageCacheHandle);
};

} // namespace content

#endif // CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_CACHE_HANDLE_H_
